{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{6}{c}}
\hline\hline
          &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         &\multicolumn{1}{c}{(4)}         &\multicolumn{1}{c}{(5)}         &\multicolumn{1}{c}{(6)}         \\
\hline
1.S#1.T   &   -0.060\sym{*}  &   -0.060\sym{*}  &   -0.058         &   -0.148\sym{**} &   -0.148\sym{**} &   -0.157\sym{**} \\
          &  (0.033)         &  (0.033)         &  (0.040)         &  (0.061)         &  (0.061)         &  (0.074)         \\
\hline
\(N\)     &    23391         &    23391         &    23391         &    23324         &    23324         &    23324         \\
\(R^{2}\) &    0.225         &    0.225         &    0.239         &    0.226         &    0.226         &    0.240         \\
\hline\hline
\end{tabular}
}
